Magnetic properties and texture of NdFeB magnets fabricated by current-applied-pressure-assisted process

The current-applied-pressure-assisted (CAPA) process has been applied to obtain full dense isotropic and anisotropic NdFeB magnets from melt spun NdFeB alloy (MQP-A). The energy product of isotropic magnets obtained by this process was 120-135 kJ/m(3)(15-17 MGOe) and the remanence was 0.8-0.9 T(8-9 kG). These isotropic magnets were deformed with different thickness reduction ratio by CAPA process. The energy product obtained by this procedure was in excess of 320kJ/m(3)(40MGOe), and the best magnetic properties obtained were B-r = 1.36T(13.6kG),H-i(c) = 868 kA/m(10.9 kOe) and (BH)(max) = 352kJ/m(3)(44.2MGOe). The effect of deformation by CAPA process on texture was examined using pole figures. The (105) texture was dominant up to the thickness reduction ratio of 74%, whereas the (006)texture was dominant at the thickness reduction ratio of 81%. (C) 2001 Published by Elsevier Science B.V.